Brake Control Apparatus Failure Detection via Motor Rotation
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Solution Overview
Problem
Conventional brake control apparatuses face challenges in accurately detecting brake fluid leaks due to unintentional pressure increases, which can lead to false negatives in failure detection.
Innovation Solution
A method that detects a failure in a brake control apparatus by calculating a first hydraulic pressure based on the number of rotations of a motor and a second hydraulic pressure detected by a hydraulic sensor, allowing for improved accuracy in leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control is used to increase pressure according to target hydraulic pressure, then the brake system can maintain desired braking force, but the possibility of failing to accurately detect brake fluid leaks increases
Solution Approach 1:
The patent segments the pressure measurement function into two independent pathways: (1) a feedback control pathway that uses hydraulic sensors to maintain target pressure for reliable brake control, and (2) a leak detection pathway that uses motor rotation count to calculate expected pressure for accurate leak detection. This segmentation allows both reliability and detection accuracy to coexist without interference.
Solution Approach 2:
The patent introduces motor rotation count as an intermediary parameter that indirectly represents hydraulic pressure. By calculating expected pressure from motor rotation count rather than directly measuring it with hydraulic sensors during leak detection, the system avoids the interference of feedback control on detection accuracy.
2Device complexity
If hydraulic pressure is increased to predetermined levels for leak detection, then the detection process can be simplified, but the accuracy decreases when brake fluid leak is small due to unintentional pressure increases from feedback control
Solution Approach 1:
The patent extracts the pressure measurement function used for leak detection from the feedback control system. Instead of relying on hydraulic sensor readings that are influenced by feedback control, the system extracts motor rotation count as an independent indicator of pressure buildup, eliminating the source of detection errors.
Solution Approach 2:
The patent performs preliminary pressure buildup by operating the pump at a predetermined rotation count before leak detection. This preliminary action establishes a known reference state where the relationship between motor rotation and pressure is predetermined, enabling accurate leak detection without relying on feedback control during the detection process.
Data Source
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AI summary
The present invention provides a brake control apparatus and a method for detecting a failure in a brake control apparatus capable of accurately detecting a possibility of a brake failure without requiring a special pressure increase operation. A brake apparatus detects a possibility of a failure based on a difference between a first hydraulic pressure in a connection fluid passage that is determined based on the number of rotations of a motor and a second hydraulic pressure detected by a hydraulic sensor.